    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
        <style>
            .box{
                height: 200px;
                width: 200px;
                background-color: #ff91bd;
                border-radius: 50%;
                margin: 100px auto;
                background-image: radial-gradient(at 50px 60px, rgba(0,0,0,0),rgba(0,0,0,0.6));
            }

        </style>
    </head>
    <body>
    <div class="box"></div>
    </body>
    </html>